Improvement in exhaust mechanisms



v. H. HALLOGK. Exhaust Mechanism.

INQ., 206,783. Patented Aug. 6, F878.

PLPE'ERS. PHOTO-UTHOGRAFHER, WASHINGTON D C UNITED STATE s PATENTGEEIcE..

VALENTINE II. HALLOOK, OF QUEENS, NEV YORK.

IMPROVEMENT IN EXHAUST MECHANISMS:

Specification forming part of Letters Patent No. 206,783, dated August(i, 1878; application iled February 2, 1878.

To all whom it may concern:

Beit known that I, VALENTINE Il. HAL- LOCK, of Queens, in the county ofQueens and State of New York, have invented a new and Improved AutomaticBlast-Regulator for Exhaust-Nozzles, which invention is fully set forthin the following specification, reference being had to the accompanyingdrawing, in which- Figure l represents a transverse vertica-l section inthe plane ma', Fig. 2. Fig. 2 isa horizontal section in the plane y y,Fig. 1. Fig. 8 is a detached sectional view of the pressure-relievingvalve on a larger scale than the previous figures.

Similar letters indicate corresponding parts.

This invention consists in the combination, with the exhaust-pipe of asteam-cylinder, and with the exhaust nozzle leading into thesmoke-stack, of a valve situated between the steam-cylinder and thenozzle, said valve being depressed on its seat by a spring or otherequivalent means, and allowing a portion of the exhaust steam to blowout before it reaches the. nozzle whenever the pressure of theexhaust-steam exceeds a certain limit, whereby the draft regulatesitself independent of the pressure ot' the exhaust-steam, undue pressureon the steam-piston is voided, and a saving in fuel is effected.

Many devices have been made for regulating the blast of exhaust-nozzles;but all of these are based on a change in the size of the mouth of thenozzle, and the majority of them have to be operated by levers or othermechanical means. lt has also been proposed to regulate the exhaustbymeans of conical plugs filling the blast-issues, and released fromsaid :issues by the action of live steam. No account of the varyingpressure of the exhauststeam is taken in the construction of thesedevices; but when the most desirable dra-ft is reached by workin g theengine at a given speed, any increase of pressure on the nozzle causedby an increased speed of the engine creates a disturbing influence onthe iire, and causes a wasteful discharge of unconsumed fuel.Furthermore, when the pressure upon the nozzles becomes excessive itcauses a back-pressure on the steam-piston, thereby reducing the working capacity of the engine.

rlhese disadvantages are avoided by my invention.

In the drawing, the letter A designates the smoke-chamber of asteam-boiler of that class known as locomotive-boilers, the products ofcombustion being carried off through the smoke-stack B, which is securedto the top of the smoke-chamber. To the sides of said steam-boiler arefirmly secured the steam-cylinders C C, from which extend theexhaustpipes I) I) into the smoke-chamber. These exhaust-pipes are bentupward, and each of them is provided with a nozzle, E, situated beneaththe smoke-stack 1S. From cach oi' said exhaust-pipes extends a branchpipe, F, the inner end of which forms the seat for a valve, G, (sec Fig.3,) which is depressed by the action of a spring, H, and the pressureexerted by this spring on the valve can be regulated by a screw-cap, I,which engages with a screw-thread cut on the branch pipe F. From thiscap arises a pipe, J, which extends out in the open air. The springwhich depresses the valve G on its seat may, however, be arranged in anysuitable manner, or it may be replaced by a weight; but it is desirablethat the pressure exerted by the weight or spring on the valve can beregulated by suitable mechanism. The position of the valveseat may alsobe changed to suit convenience.

If my blast-regulator is used on an engine with a single steam-cylinder,the exhaustnozzle is placed directly beneath or in line with the centerof the smoke-stack.

The valves G are adjusted according to the pressure of theexhaust-steam, which is found by experience to produce the best draftunder given circumstances, and whenever the pressure of theexhaust-steam exceeds this limit the valves are raised and a portion ofthe steam escapes through the pipes J, so that the blast remainsuniform, and undue back-pressure on the steam-pistons is avoided.

It will be seen from this description that my blast-regulator isentirely automatic after the valves G have been adjusted to the desiredpressure, and a steady blast of uniform power is produced, so that nofuel is wasted.

What I claim as new, and desire to secure by Lett-ers Patent, is-

The exhaust-pipe I),leading from the steamv vlinder into the smoke-box,and having;l a have hereunto set nl v hand and seal thibl 25th branchpipe, 1i, within smoke-box, provided day 0f January, 1878. wlth a valve,and a nozzle, J, terminating;`

outside ofthe smoke-box, constructed snb- ALPTDP n' HALLO( I" U"stantially as shown and described, forthe pnr- \\'itnesses: pose setforth. W. HAL'FP,

In testimony that I elainl the foregoing: I I 15.1". KASTENIIIBER'.

